Apparatus for guiding wide belts

ABSTRACT

996,850. Artificial ski-slopes. SKI-DEK CORPORATION. Nov. 13, 1962 [Nov. 14, 1961], No. 42875/62. Heading A6D. An artificial ski-slope comprises an endless belt 16 of material such as nylon pile fabric entrained over rollers 14 and 15, the former being driven from a prime mover 19, means being provided for correcting any lateral displacement of the belt relative to the rollers, resulting from manoeuvres executed by skiers on the slope. The correction is effected by means of auxiliary endless belts 35 entrained in grooves 36 formed in the roller 15 and over grooved pulleys which are supported from the frame of the slope so as to be laterally displaceable relative thereto, the pulleys being connected to displaceable feeler rollers 48 located on opposite sides of the lower run of the belt 16. Thus displacement of the belt 16 results in displacement of the belts 35, so that the latter are fed to their respective grooves 36 at an angle and tend to rise out of the grooves. The weight of the belt 16, however, forces the auxiliary belts back into their grooves, the sloping sides of the grooves causing simultaneous lateral displacement of the auxiliary belts, and the coefficient of friction between the belts 16 and 35 is arranged to be such that the belt 16 is also moved laterally, thereby gradually correcting its original displacement. When the correction is completed, the feeler rollers 48 and grooved pulleys resume their normal positions and the belts 35 resume their movement parallel to the direction of movement of the belt 16 and are located within the grooves 36.

Jan. 5, 1965 R. L. HALL APPARATUS FOR GUIDING WIDE BELTS Filed Nov. 14,1961 4 Sheets-Sheet 1 Jan. 5, 1965 R. L.. HALL 3,164,247

APPARATUS FOR GUIDING WIDE BELTS Filed NOV. 14, 1961 4 Sheets-Sheet 2INVENT l 19,4

F/G' 6 KAY/70N@ Jan. 5, 1965 R. L. HALL 3,164,247

APPARATUS FOR GUIDING WIDE BELTS Filed Nov. 14, 1961 4 Sheets-Sheet 3Jan. 5, 1965 R. L. HALL APPARATUS FOR GUIDING WIDE BELTS Sheets-Sheet 4Filed Nov. 14, 1961 I i lI L Y is reliable impor-forming its intendedfunction.

United States Patent 3,i6fi,24;7

APPARATUS FR GUIDING WIDE BELTS Raymond L. Hall, @aidu/ell, NJ.,assigner to Ski-Dek Corporation, Caldwell, N J a corporation oi?Deiaware Fiied Nov. 11i', Hoi, Ser. No. 152,393 9 Claims. (Ci. 19d-2912) The present invention relates to a method of and apparatus forcontrolling a continuous moving web and more particularly to an improvedapparatus for maintaining a wide belt in a substantially straight path.

Wh'Lle the present invention may have other uses it is particularlyadapted for and is shown applied to an apparatus for simulating anatural ski slope. The artificial ski slope comprises an inclined deckAand a continuous belt of a material having a low coehcient of friction,such as a nylon pile fabric, which moves up the deck at a substantialrate of speed. The belt is mounted on rollers at the top and bottom ofthe slope and thus forms a continuous web. The belt has a considerablewidth of, for example, sixteen feet and a length of, for example, thirtyfeet. The total weight of such belt is approximately ifteen hundredpounds and moves at speeds which may vary between tive and twenty milesan hour at'the option of the skier. Such an artificial ski slope givesthe person skiing `on the belt a sensation' of moving down the slopewhich'simulates actual skiing on a naturalV ski slope. `A person usingthe ski slope may perform conventional maneuvers, such as plowing toreduce speeds, Christiana turns, jump turns, andthe like, and suchmaneuvers are apt to lproduce a resultant force onVV the belt tending tomove it laterally in one or 4the `other-` of two directions. InV

addition, the belt may have an `inherent characteristic tending to causeit to drift laterally in either. direction.

Conventional methods of belt control, such as crowned pulleys, tiltingrollers and the like, were found `to be unsatisfactory in controlling abelt of such width and eight` Automaticallyk operated jacks for tiltinga supporting roller were found to require continuous adjustment, tendedto overcompensate, required considerable horsepower because of theweight involved and did not operate satisfactorily to maintain the beltin a substantially straight path.

Gne of the objects of the present invention is to provide an improvedmethod of and -apparatusfor controlling the path of movement of acontinuous web which utilizes the energy Vin the moving webitself toprovide the force required tochange its direction.v Y t Another objectis to provide a-method of and apparatus for maintaining a moving belt ina substantially straight lpath by directing an auxiliary control beltbetween it and ratus of the type indicated which is of simple andcompact construction, economical to manufacture and Aone whic These yandother objects willC become more apparent from the'following descriptionand drawings in which likereference characters denote like partsthroughout the several views. It is to be expressly understood, however,

that the drawings are for the purpose of illustration only andare not adenitionof the limitsof the invention, reference being had for thispurpose to the appended claims. l

attratti Patented dan. 5 i965.

IQC

In the drawings: FIGURE l is a side elevational view of an artificialski slope incorporating the novel web controlling device of the presentinvention;

FIGURE 2 is a plan view of the simulated ski slope, partly in section,and showing a plurality of auxiliary control belts operating between themain belt and V- grooves in a supporting roller to maintain the mainbelt in a substantially straight path;

FIGURE 3 is an enlarged sectional view of the lower roller in sideelevation and showing the auxiliary control belts seated in the groovesbetween the main belt and its supporting roller when the main belt istracking properly;

FIGURE 4 is a sectional plan of the lower roller and showing the threedifferent directions that the auxiliary control belts may feed towardthe V-grooves in the supporting roller;

FIGURE 5 is a sectional view of a portion of the left hand end of thesupporting roller and showing one V-groove and the manner in which theupper course of the main belt is shifted toward the right when theauxiliary control belt feeds from the left toward the right;

FIGURE 6 is a view similar to FIGURE 5 showing the manner in which theupper course of the main belt is shifted towardthe left when theauxiliary control belt- -y feeds from the right toward the left; v

v FIGURE 7 is an enlarged sectional View through one z of the grooves toshowthe ysmoothlining of an antifriction material on the inclined sidesof the groove;

FIGURE 8 is a transverse sectional'view taken on line i 3 8 of FIGURE 2vto show an auxiliaryfcontrolbelt between the main belt to'be controlledand supporting roller rality of pivotally mounted depending armsfor theguideV pulleys and Yfeele'rs; A T

FIGURE 11 is a section taken on line 11--11 of FIG- URE l0 to show thebracket for mounting the depending pivoted arm carrying the feelers` atone end of the sliding Y control bar; and y FIGURE l2 is a partialsectional View taken on linev iZ-'iZ of FIGURE 10 to show the bracketfor pivotally mounting one of the depending arms mounting a guide Themethod of the present invention comprises the steps ofi-sensing anychange in the direction of movement of a web to be controlled, such asthe wide belt of an artificial ski slope, and utilizing such change indirection to change the position of a belt guide for guiding one or morenarrow control belts between the belt to be controlled and a V-shapedgroove in a web supporting roller and at-an angle to the direction ofmovement of the main belt. For example, if the belt tends to move towardthe right, the narrow control belt is guided atv an angle to thedirection of movement of the main belt from the right toward the left;if the beltrtends to move toward the left, the narrow belt is guided atan angle to the mainy I belt from. the left toward the right; and if thebelt is tracking properly the control belt is guided in a directionparallel to the main belt.f The langular movement of the auxiliarycontrol belt is y,then utilized to bodily shift the A main belt to acorrective position and the rate of shifting' degree ofthe angle of theauxiliary smooth inclined sides to present a minimum frictionalresistance. To this end, the sides ofthe. grooves may be coated withmaterial having' a low coefficient of friction,

Vof a skier using the slope.

.each auxiliary control belt at an angle to the path of movement of .thebelt to be controlled, the frictional contact of the periphery of theauxiliary control belt with the belt to be controlled produces a lateralforce on the latter as the sides of the control belt are forceddownwardly into the V-shaped groove on the roller and laterally by theinclined side thereof. Stated another way, the belt to be controlledforces the control belt to seat in the V-shaped groove as it wrapsaround the roller and to be cammed laterally by the inclined side of thegroove, but the frictional contact of the periphery of the control beltwith the belt to be controlled causes the latter to move laterally withthe auxiliary belt.

v It will be observed that the method of controlling in accordance withthe present invention untilizes the energy in the web or belt itself tocontrol and change its direction of movement. As a belt to be controlledmoves toward and around a supporting roller it drives the auxiliarycontrol belt with it in the same direction and the force and weight ofthe main belt wrapping around its supporting roller forces or jams theauxiliary control belt in to the V-shaped groove in the supportingroller. Such movement of the auxiliary control belt inwardly along theinclined side ofthe groove cams it laterally and the lateral movement istransmitted by the frictional engagement of its .outer periphery withthe belt to be controlled to, in turn,

i 'ment into its groove, the greater willfbe the frictional forcebetweenthe belts and the radial force on the control belt causing it tobejammed into its groove and to l bodily shift the main belt laterally.Thus, all of the force required to control the belt is supplied from thel belt itself without increasing the power required to drive the belt.

` Referring now to the drawings, an apparatus for carrying out themethod of the present invention isshown ap- .pliedA to an artiticialskislope 12. Asshown in FIGURES l and V2, the ski slope comprisesaninclined deck 13 having; pulley rollers 14 and 15 at the top and bottomand a continuous belt 16 vsupported by the rollers and movable upcthesurface 'of theinclined deck. Deck 13 is supported from a iioor 17 byspaced stanchions 18, 1li-a, llb and 18C and the upper roller 14 isdriven from a combined motor ,and variable speed transmission 19 througha belt 2b. y Roller-14 drives the upper course of the belt 16 upy wardlyover the top of the deck 13 and the roller has friction strips 25between it and the belt. The lower course of belt ltunderlies the deckand is supported by rollers 21 and 21a on the stanchions 1S. Horizontalplatforms 22 and 23 are provided at the upper and lower ends of the deck13 and the ski slope has side rails 24, only one being vshown in FIGURE1,"at the sides ofthe moving belt 16.

Vplate is the upper course of belt 16. The beams 29 and fill aresupported by the stanchions 18 andthe latter are cross braced to'providea rigid structure. Belt 16 comprises a material having a low'coefhcientof friction, such as nylon pile fabric, so that it slides -Ielative tothe skis The deck may be inclined at an angle of,for example 11 to thehorizontal and may l be driven at a. speed of, for example nine milesper hour.

y,In accordance with the present invention the con-trol means Vcomprisesat least .one auxiliary control belt 35 .between the main belt 16 and algroove 36 inV one of the. rollers 14 and 15 supporting the belt. Theouter periphery of the auxiliarycontrol belt 35 frictionally engages thelbeltld to be controlled so that it, in effect, forms a dependingrib onthe main belt, but without rigid attachone direction or the other by theinclined sides of the groove 36 depending upon its angular directionwith respect to its path of movement of the belt to be controlled. Thedirection of movement of the auxiliary control belt 3S, in turn, ischanged in response to any lateral movement of the main belt to guidethe auxiliary control belt at the desired angle to the path of movementof the main belt 16. Thus, immediately upon any lateral movement of thebelt 1o the auxiliary control belt 35 is adjusted so as to advance at anangle to the direction of movement of the main belt which is opposite tothe direction in which the main belt tends to drift. The angularmovement of the control belt then bodily moves the main belt to acorrective position by the ritcional engagement of the two belts. ln theillustrated embodiment a plurality of the auxiliary belts 35 areprovided with corresponding grooves 36 in the supporting roller 14.

As shown more in detail in FGURES 3 :to 9, the grooves 36 and 36a in theperiphery of the lower roller 15 are V-shaped with a relatively wideangle of slope. The sides of the grooves 36 are inclined inwardly towardeach other and have a smooth anti-friction surface. Preferably, thesides of the grooves 36 are lined With an anti-friction material 37,such as Tetlon, to otter a minimum resistance to the sliding movement ofthe sides of the belt as it seats in a groove. The rollers 14 and 15 maybe formed of pipe sections with the grooves 36 formed in the wall of theroller 15, or a thin walled tube may be built-up with a wrapping intowhich the grooves are cut, or cylindrical sections may be slid intoposition over the outer periphery of the pipe sections and weldedthereto with the sections being so shaped as to form the grooves. Asshown in FIGURES 3 to 5, the hollow rollers 14 and 15 `have discs 38welded therein and mounting axles 39 vat its opposite ends.

The auxidary control belts 35 are of a narrow V-shaped form incross-section so that the inclined sides cooperate with the smooth sidesil@ and 41 of the groove 36 and have a peripheral friction surface 42see FIGURE 7.

rl`he auxiliary control belts 3S are in the form of a continuous loopwhich is captured between the main belt 16 and groove 36 in thesupporting roller 15. Each auxiliary belt 35 is driven by the main beltlo, due to the frictional engagement of its periphery 42 therewith, andis jammed into its respective groove 36 by the force of the surroundingbelt 16, but the smooth sides 4Q and 41 of the groove 36 cause the sidesof the auxiliary belt to freely slide into and seat in the groove. Whenthe main belt 16 is tracking properly each auxiliary control belt 3Smoves into its groove 36 parallel to the direction of movement of themain belt, as shown in FIGURE 3. However, the auxiliary control belts 3Smay be actuated in unison to move at an angle to the direction ofmovement to the main belt, as shown in FIGURE 4. When an auxiliarycon-trol belt d5 is directed toward its groove 36 in an angulardirection from the left toward the right, as shown in FIGURE 5, it isjammed into its groove 36 and is cammed to the right to bodily shift themain belt 16 to the right. FIGURE 6 illustrates the manner in which themain belt 16 is shifted toward the lett when the auxiliary control beltis directed toward its groove 36 from the right toward the left in anangular direction to the path of movement of the main belt.

FlGURE 2 illustrates the manner in which one or a plurality of auxiliarycontrol belts 35 are guided to control the angular direction in whichthey move toward their respective grooves 36. In the illustratedembodiment the guide means for guiding the auxiliary control belts '35comprises a grooved pulley 45 for each control belt 3S, but other formsof guides may be used. Each pulley 45 ismounted to rotate and is engagedby an auxiliary control belt. The plurality of grooved pulleys l5 and45a for the auxiliary belts l5 and 45a are connected together formovement as a unit by a connecting bar 46. Bar 46, in turn, hasdepending feelers 47 and 48 at its opposite of the belt 16 to becontrolled. Thus, any lateral movement of the belt 16 in eitherdirection is transmitted to the bar 46 which moves the pulleys 45 and45a in the same direction that the belt tends to drift. Such movement ofthe pulleys 45 and 45a then directs the auxiliary control belt 35 at anangle to the direction of movement to the belt 16 and in a directionopposite the direction which the main belt tends to drift. Thus, theauxiliary control belts 35 depend from themain belt 16 at an angle tothe direction of movement of the main belt and are cammed laterally bythe grooves 36 in the roller 15 to bodily move both belts laterally dueto their frictional engagement.

Guide pulleys 45, bar 46 and feelers 47 and 48 may be mounted in anysuitable manner for operation by any suitable sensing mechanisms. In apreferred form of construction illustrated in FIGURES 8 to l2, the guidepulleys'45, 45a, etc. are mounted on a transverse frame plate 50extending between beams 29 and 30 below the deck 13. As shown mostclearly in FIGURES 8 and 12, each grooved guide pulley 45 is mounted atthe lower end of a depending arm 51 pivotally mounted at its upper endon a pin 52 projecting forwardly from a bracket 53 on the horizontalframe plate 50. The lower end of the depending arm 51 is bifurcated toform a fork having side arms 54 and 55 straddling its pulley 45 andmounting a pivot pin 56 on which the pulley rotates. Each arm 51 has apivot pin 57 projecting from one side on which a cross head 5S pivots.The cross heads 5S for the plurality of arms 51 are connected by the bar46 extending through the cross heads and attached thereto by setscrews59. Thus, when the bar`46 moves laterally in one direction it actsthrough the pins 57 to swing the arms 51 on pivots 52 and move thegroove pulleys 45 in unison to one side or the other. i

The feelers 47 and 48 at opposite ends of the bar 46 each comprises apair of rollers 62 and 63, as shown in FIGURES 8 and ll. The rollers 62and 63 are mounted to 'rotate on and depend vertically from a'plate 64,and

the plate is attached to the lower end` of a swinging arm Vviewed inFIGURE 2, itmoves the guide pulleys 45 and a to the left and therebydirects the auxiliary control belt toward its groove 36 from the lefttoward the right to move the belt backto its proper tracking position.If,

- on the other hand, the fve'eler`43 is moved to the right the bar 46and guide pulleys .45..aremoved to the right to directthecontrolbelts.35 toward the grooves 36 at an anglefrom right to. left to correctthe direction of movement of the main belt.'` One form of constructionhaving vnow been describedl in Vdetail,'1the mode of operation is nextexplained. y Assuming for the purpose of description that the ski slope12 is in operation with the belt 16 being driven by the motor 19 throughbelt Ztl andfupper roller 14 and that a person is skiing on the movingbelt. If the upper course of the belt 16mm/es laterally at any time dur-Such movement ofthe bar 46 is transically in an angular directionv fromthe left toward the right.

As shown most clearly in FIGURE 8, each guide pulley 45 is located toposition the outer periphery ofv the auxiliarycontrol belt 35 in contactwith or closely adjacent the inside of the lower course of the main belt16 to-be controlled. Thus, as the auxiliary control belt 35 moves towardits groove 36 in roller 15 its outer periphery frictionally engages themain belt 16 to form a projecting rib extending at an angle to itsrdirection of movement. As the wrap of each auxiliary guide belt 35 islocated in its groove 36, the angular portion approaching the groovetends to move in a straight line and ride up on the left hand side ofthe groove. However, the auxiliary guide belt 35 immediately slides downthe smooth side di of the groove as it is jammed into the groove by thesurrounding wrap of the main belt 16. The belt16 to be controlied ismuch larger and heavier than the auxiliary control beit 35 so that itjams the auxiliary belt into the groove, and as the periphery of theauxiliary control belt is in tight frictional contact with the outerbeit the inclined side of the groove 36 cams both belts to the right asa unit in the manner illustrated in FIGURE 5. In some instances thecorrective shifting ofthe main belt i6 may occur between the guidepulley 45 and roller v15 and in other instances thecorrective shift ofthe belt may occur only at the wrapped portion of the auxiliary controlbelt 315 as it seats in its groove 36. In either case, the auxiliaryguide belt 35 bodily moves the main belt 16 in the opposite direction,or to the right,

from the direction in which it tends to drift.

Such correcive movement of the main'belt 16 then runs throughV theuppercourse and lower course and actuatcs the feeier 43 to move the bar46 in thefopposite direcz tion or to the right as viewed in FIGURE 2.Such movement of thebar is transmitted through the depending arms Si andguide pulleys 45 to move them blaclt` into ya pathy parallel to thedirection of movement of the main belt, as illustrated in FIGURES 2 and3. When the main belt 16 and auxiliary control belts 35 'move parallelto the direction of the main belt the auxiliary control belts tend tohold the main belt in a straight path.

If the main belt 16, tends to drift in the opposite direction, or to theright as viewed in FIGURE 2, the feeler Zidis actuated laterally to theright and moves the guide pulleys y 45 to the right todirect 'theauxiliary guide belts ,angularly to the direction of movement of thelmain belt from right to left. Suchfan angular relationof the auxiliarycontrol beltsy 45 then cooperate `with the main ing operation'thelateral movement is transmitted tothe lower course so` that the edge ofthe beit actuates feel'er 47 or 48'v laterally as, for example, to theleft, as shown in FIGURE 5. Fceler 47 tast on bar 46,1noves the latterWhen guide pulleys 45 are pulled to theleft they direct the auxiliarycontrol belts 35 atan angie tothe direction of movement of the belt i6totbe controlled and more specifbelt le and' `grooves 36 in the mannerpreviously 1described to bodily shift the mainbelttoward the left to'correct the'driit'of the main belt. Following such cor-1V Yrectivemovement theauxiliary control belts are -mnved back into parallelArelation with themain'belt to be con# trotted?, e 'Y ,-1 It will nowb'eobservedthat the'.presentinventionprovides an improved apparatus formaintaining Yacontinuvous web a"substantially straight path'by utilizingthe energy otr'the webitself to provide the force required to change itsdirection of movement.' `It also will'be `ob'fl p served thatthe presentinvention provides an improved apparatus for maintaining the alignmentof a relatively wide belt by directingran auxiliary control belt betweenit and a groove in a supporting roller in a direction'opposite thedirection that the belt to be controlled tends ,todrift Y Y lt willfurther be observed thatthe present inventionprovides an Yimprovedapparatus 'for tracking 'the moving belt of anv artificial ski slopeWhichutilizesvany lateral movestruction, economical to manufacture andone which is reliable in performing its intended function.

While a single embodiment of the invention is herein illustrated anddescribed, it will be understood that changes may be made in theconstruction and arrange* ment of elements without departing from thespirit or scope of the invention. Therefore, without limitation in thisrespect, the invention is defined by the following claims.

l claim: l

lfApparatus for controlling a continuous web cornprising a roller incontact with the web and having at least one groove therein with smoothsides inclined inwardly towards each other, an `auxilary belt mountedfor movement between the web and groove in the roller, said belt havingopposite sides adapted to contact and slide on the smooth sides of thegroove and a friction surface at its outer periphery for frictionalContact with the web to be controlled, and a guide spaced from theauxiliary belt having opposite sides adapted to contact and slideinwardly on the smooth sides of the groove and a friction surface at itsouter periphery for frictional contact with the web to be controlled, abelt guide spaced from the roller, .and means responsive to the lateralmovei i ment of the continuous web and connected to the belt guide formoving the latter laterally in the same direction astheweb. Y Y

3. Apparatus for vcontrolling a wide continuous belt supported at oneend by a roller, said roller having at least one V-shaped groove thereinwith smooth sides, a V-shaped control belt between said wide belt to becontrolled yand groove Vini the supporting roller, the inclined sides ofsaid Vtl-shaped controlV belt being adapted to slide downwardly on theinclined sides of the V-shaped grooves Vin the roller and said controlbelt having a'. friction survface at its Vperiphery to frictionallyVgrip the belt to be controlled, a guide pulley for said control belthaving a V-shaped groove and, mounted` to move laterally, and meansconnected to the guide. pulleyrand responsive to lateral movement of thewide belt Yto be controlled forV moving the guiderpulley in the samedirection whereby to, move the wide belt to be controlled intheropposite .direction by the friction grip between itl and thecontrol` belt as the latter moves toward andinto the groove iny theroller.

. VV'4. In an apparatus for simulating aislci'islope"c o'rnprisinganinclined deck having. rollers at theftop and bottom,

a wide belt of a material having a lowcoelcient of fric-v .tionandprirne mover'means for drivingone ofthe rollers to causefthe VWidebelt to move upwardly along the topof the deck, the combination withsaid apparatus of belt aligning means for maintaining the wide belt in asubstantially straight path comprising a il-shaped groove in one of therollers, an auxiliary tf-belt between the wide belt and groove in theroller, said groove and auxiliary control belt having relatively smoothsides to adapt the auxiliary belt to slide downwardly into the grooveand said auxiliary belt having a friction surface at its periphery, anda guide spaced from the groove in the roller for directing the auxiliarycontrol belt toward the groove in the same and opposite angulardirections to the path of movement of the wide belt to be controlled,and means responsive to lateral movement of the wide belt for moving theauxiliary belt guide guide laterally relative to the V-groove in theroller.

5. An apparatus in accordance with claim 4 in which the upper roller isdriven from said prime mover to drive the wide belt and the lower rolleris driven by the belt, the V-shaped groove being provided in the lowerroller, and the auxiliary control belt being driven by the frictionalengagement of its periphery with the moving belt to be controlled sothat the latter provides l'the force required to change its lateraldirection of movement.

6. An apparatus in accordance with claim 4 in which the sides of thegrooves are covered with an anti-friction material whereby to adapt theauxiliary control belt to slide freely into the groove .as it movestoward the groove at an angle to the path of movement to the main beltand thereby move the main belt in the same direction by its frictionalengagement therewith.

7. An apparatus in accordance with claim 4 in which the guide is apulley having a V-shaped groove, means for mounting the pulley formovement laterally, and said means for moving the guide pulley beingconnected to move the pulley in the same direction as the main belttends to drift.

8. An apparatus in accordance with claim 7 in which a bar is mounted toslide laterally, means connecting the guide pulley to the bar forlateral movement therewith, and said means responsive to the lateralmovement of the guide belt comprising guide rolls at each end of :thebar and contacting opposite edges of the Wide belt to be controlled. i

9. An apparatus in accordance with claim 4 in which the supportingroller for the wide belt is provided with a plurality of spaced V-shapedgrooves, an auxiliary control `beltrfor each of the grooves, and themeans responsive to lateral movement of the'wide belt comprising acontrol bar mounted to move laterally, said bar having a guide for eachcontrol belt, and said means responsive to lateral movement of the widebelt being connected4 to move the control bar inthe same direction.

References Cited in the tile of this patent

1. APPARATUS FOR CONTROLLING A CONTINUOUS WEB COMPRISING A ROLLER INCONTACT WITH THE WEB AND HAVING AT LEAST ONE GROOVE THEREIN WITH SMOOTHSIDES INCLINED INWARDLY TOWARDS EACH OTHER, AN AUXILIARY BELT MOUNTEDFOR MOVEMENT BETWEEN THE WEB AND GROOVE IN THE ROLLER, SAID BELT HAVINGOPPOSITE SIDES ADAPTED TO CONTACT AND SLIDE ON THE SMOOTH SIDES OF THEGROOVE AND A FRICTION